US2617072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for switching contact circuits for signaling purposes
Assignee: Hartford National Bank and Trust Co
•
Filing: 1951-05-09
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Granted: 1952-11-04
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Expires: 1971-05-09
Abstract
No abstract record available.
Inventors
- 👤 Zeger Van Gelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/04; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/045; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/525
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |